Knee brace



FIG. 1 is a first side elevational view of a knee brace, showing our design.

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a second side elevational view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a knee brace, as shown and described. 